Background: The failure of endodontic treatment caused by failure of the restoration and bacterial invation. Alongside proper chemical and mechanical preparation and hermetic obturation of the root ...canal system, another essential factor is ensuring a permanent and hermetically-sealed restoration following endodontic treatment. Endodontic retreatment encompasses the efforts to salvage a failing previously endodontically treated tooth. As a result of advances in endodontic materials and adhesive systems, restorations in the form of fiber post and adhesively cemented crown are becoming a choice in cases of teeth that have extensive damage. Case: A case is presented a 45-year-old female was referred to Prof. Soedomo Dental Hospital with a complaint of pain in mandibular second premolar which was earlier endodontically treated. Clinical and radiographic examinations showed damaged restorations, gutta percha filling that are not hermetic and radiolucent on periapical. A successful endodontic retreatment premolar using rotary retreatment file and preparation with crown down technique using rotary progressive multiple tapering file, with comprehensive endo-prosthetic treatment using prefabricated fiber post and porcelain fused to metal crown. Conclusion: Clinical and radiographic evaluation after 6 months showed complete healing and good adaptation of the restoration. The outcomes of this case showed that failure of endodontic retreatment respond favorably to endodontic retreatment, with proper indication, prefabricated fiber post and porcelain fused to metal crown can provide an effective conservative and esthetic option for reinforcing endodontically treated teeth.
Background: Full-coverage porcelain fused to metal crowns is commonly recommended for restoration of extensively damaged teeth. Ability of the dentist to adequately prepare teeth is fundamental to ...success and longevity of these restorations. Aims: This study was designed to compare recommended convergence angle and taper values of tooth preparation with clinically practiced values and to assess the factors such as tooth position, operator experience, vitality, and restorative status on convergence angle of prepared teeth. Setting and Design: It was a descriptive, cross-sectional study design and held at The Aga Khan University Hospital, Dental Section, for a period of 1 year. Materials and Methods: A minimum of 197 crown preparation models of molar and premolar teeth prepared by residents and specialists were collected in order to achieve the objectives of the study on the basis of convenient sampling technique. Statistical Analysis: One sample t-test used to compare the mean practiced convergence angle values with its recommended values. Independent sample t-test and one-way ANOVA was used to see difference in the convergence angle values of the teeth prepared by different operators, tooth type, vitality status, and restorative status of teeth. Results: Mean reported convergence angle and axial wall taper values were 23.7+-8.9 and 11.3+-7.8, respectively, which is significantly greater (P<0.001) than the recommended values. Convergence angle values were greater for molars as compared to premolars. Conclusion: There was a considerable disparity between the convergent angles values recorded in this study and the recommended guidelines and are affected by tooth type, vitality, and restorative status of tooth.
Improper treatment plan, designing of the restorations and the selection of the restorative materials resulted in patient unsatisfactory. The purpose of this case is to create a hygienic and esthetic ...restoration for the patient with good social acceptance. Individual all ceramic zirconia crowns were fabricated for a 54-year-old male patient who attended the clinic with a multiunit joined porcelain fused to metal restoration. The esthetic treatment with all ceramic computer-aided design and computer-aided manufacturing crowns resulted in improved facial aesthetics; psychological status and social life of the patient. In addition to that, patient can practice standard oral hygiene in the present of separated crowns.
Abstract The ability prepare a tooth for a restoration is an important aspect of dentistry. This resource contains a 16-minute fully narrated instructional video depicting the stepwise procedure for ...the preparation of tooth # 21, a mandibular left first premolar for a full ceramic metal restoration using a chamfer-type finishing line. The procedure is performed on a mannequin mandible. The presentation goes from the unprepared tooth to the completed preparation with access to the buccal, mesial, distal, and lingual aspects of the tooth by means of chapter markers. The audio-video presentation of the preparation allows enhanced and enlarged unobstructed close-up views. The narration explains precisely the why and how the procedure is performed. The successful mastering of the preparation concepts and its implementation on the mannequin tooth will prepare the dental student to progress to the preparation of a multi-unit bridge restoration, when this publication is reviewed in conjunction with MedEdPortal publication # 8474 entitled “Tooth # 19 Full Cast Crown Preparation Chamfer.”
The aim of this paper is to propose a customized dental framework (coping) design system to improve artificial teeth production. First, a structure light optical scanner is used to scan the teeth ...model. And the registration and triangulation algorithms are used to reconstruct the scanned data to a triangular solid model. In the coping design process, the first part is to find the margin lines of the prepared abutment teeth. Then the non-uniform offsetting and shelling algorithm is proposed to create the coping shell model with variable thickness. When restoring an edentulous space with a fixed partial denture that will crown the teeth adjacent to the space and bridge the gap with a pontic the restoration is referred to as a bridge. When the size or shape of coping and pontic models are not correct, some deformation tools are proposed to edit manually. Finally, the connector will be created between coping and pontic models.
Background : Complex aesthetic treatment on anterior teeth involves more than one caries tooth with malformed shape and malposition. Purpose : The purpose of this paper is to find the alternative ...treatment for anterior maxillary teeth with malposition. Case : In this case, a 25 year-old man with a peg shaped teeth and caries on several teeth and malposition can be treated with complex aesthetic treatment. Case management : Endodontic pulpectomy treatment on anterior maxillary teeth and post construction with splint porcelain fused to metal crowns on 11, 12, and 21, 22 to correct the shape and position into normal position. Conclusion : Malformed and malpositioned teeth with caries can be treated with complex aesthetic treatment.
To compare the long-term clinical effects of two kinds of crowns and bridges made of porcelain fused to Au-Pt alloy and Ni-Cr alloy.
A total of 131 teeth (64 patients) were rehabilitated using ...porcelain-fused-to-metal crowns, among which 59 were rehabilitated with Au-Pt alloy metal ceramic crown and 72 with Ni-Cr alloy metal ceramic crown.The porcelain fracture, shade, marginal adaptation, gingival discoloration, and gingival status after finishing restoration and 36 months of follow-up were evaluated.
After 36 months of restoration, porcelain fused to Au-Pt alloy crown showed better clinical effects than porcelain fused to Ni-Cr alloy crown in shade, marginal adaptation, gingival discoloration, as well as gingival status (all P < 0.05).
The Au-Pt alloy ceramic crown is superior to Ni-Cr alloy ceramic crown in long-term clinical effects.
Objective To evaluate the mechanical properties and porcelain bond strength of domestic CoCr alloy specimens based on selected laser melting (SLM) technology. Methods SLM technology was used to ...construct dumbbell specimens (0°, 45° and 90°) and ceramic specimens. The cast specimens of the same size were made by traditional casting method. Tensile test was carried out at room temperature and the shape of the microstructure was observed. The porcelain bond strength was measured by a three-point bend test, and the metal-ceramic interface was observed by scanning electron microscopy. Results There were significant differences in mechanical properties (including elastic modulus, tensile strength and elongation) among the casting group, the domestic SLM group and the imported SLM group (P < 0.05). In the SLM group, there was no significant difference in elastic modulus, tensile strength and elongation among different fabricated angles. The porcelain bond strength of casting group was 30.78±3.23 MPa, which was lower
This clinical report describes a conventional resin-based fixed partial denture for a 42-year-old woman to close an edentulous space in the region of the second maxillary premolar. While the first ...maxillary molar had been crowned with porcelain fused to metal (PFM) system 10 years ago and the first premolar was intact and sound except for a small carious lesion in the distal aspect. The essential clinical and laboratory procedures are illustrated.
Multiple clinical studies document excellent long-term success of resin-bonded fixed partial dentures. In the 1970s, the Rochette resin-bonded fixed partial denture (RBFPD) was introduced. Next, to enhance retention and resistance form of posterior RBFPD preparation of parallel guide surfaces on the interproximal aspects of the adjacent teeth along with rests on the occlusal aspects to counteract dislodging forces was recommended.
A 42-year-old woman presented with an extracted left maxillary second premolar. The first maxillary molar had been crowned 10 years ago and the first premolar had a small carious lesion in the mid distal of proximal aspect. To eliminate unnecessary cutting of the PFM of the first molar and crown preparation of the first maxillary premolar, the use of RBFPD was suggested and accepted by the patient.
This clinical report described the indication, the selection of a PFM-crowned abutment, and clinical procedures involved in the fabrication of RBFPD that provided a conservative solution for replacement of one posterior tooth.
RBFPDs can be used successfully in both the anterior and the posterior regions of the mouth to replace one or two missing teeth. However, the survival rate of RBFPDs is still considerably less than that of conventional fixed partial dentures. The principal reason for failure is debonding of the framework from the abutment tooth. The selection of nonmobile abutment teeth, the preparation design that enhances retention and resistance form, and the tooth bonding technique are critical for success.
Titanium and titanium alloys are difficult to machine. This problem arises when milling, using dental CAD/CAM systems. In a previous study, an experimental binary titanium alloy with 20 mass% Ag ...showed good grindability. In this study, the fracture strength of porcelain fused to a Ti-20 mass% Ag alloy crown made using a CAD/CAM (GN-1, GC, Japan) system is investigated. As controls, similar pure titanium (JIS grade II) samples made using cast and using the CAD/CAM system were also examined. The crowns were made assuming a maxillary left central tooth. The fracture strengths were statistically analyzed using one-way ANOVA followed by Tukey pairwise tests. There was no significant difference in the fracture strength of porcelain fused to metal crowns between the Ti-20 mass% Ag alloy frame crowns and the pure titanium frame crowns.
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